The separation of Eu

3+

is studied with a dispersion combined liquid membrane(DCLM)

in which polyvinylidene fluoride membrane(PVDF)is used as the liquid membrane support

dispersion solution containing HCl solution as the stripping solution

and 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester(P507)dissolved in kerosene as the membrane solution.The effects of pH value

initial concentration of Eu

3+

and different ionic strength in the feed phase

volume ratio of membrane solution to stripping solution

concentration of HCl solution

concentration of carrier

different stripping agents in the dispersion phase on the separation are investigated.The optimum condition for separation of Eu

3+

is that concentration of HCl solution is 4.0 mol·L

-1

concentration of carrier is 0.16 mol·L

-1

and volume ratio of membrane solution to stripping solution is 30:30 in the dispersion phase

and pH value is 4.2 in the feed phase.The ionic strength has no significant effect on separation of Eu

3+

.Under the optimum condition

when the initial concentration of Eu

3+

is 0.8×10

-4

mol·L

-1

the separation percentage of Eu

3+

is 95.3% during the separation time of 130 min.The kinetic equation is developed in terms of the law of mass diffusion and the theory of interface chemistry.The diffusion coefficient of Eu

3+

in the membrane and the thickness of diffusion layer between feed phase

and membrane phase are obtained and their values are 1.48×10

-7

m

2

·s

-1

and 36.6μm

respectively.The results obtained are in good agreement with literature data.